This program can read the SysEx timbre dumps of these Roland LA-synthesis synths (Roland MT-32, CM32L, LAPC-1) and very accurately convert them into synthesis models that can be played using the built in Awave software synth.
Currently they can't converted to other formats - thus mostly limiting the use of this to "nostalgia".
For this to work you need to have a memory dump from the "PCM ROM" on one of these synths (which contains all of the waveform data that is necessary to use the instruments).
If you also have a memory dump of the "Control ROM" then the the factory timbres can also be read and converted to synthesis models.
To get hold of these ROM dumps you either need to own one of these synths and have the tools and knowledge of how to read the data off the chips, or you could search the net for files specifically named "MT32_PCM.ROM" and "MT32_CONTROL.ROM", alternatively "CM32L_PCM.ROM" and "CM32L_CONTROL.ROM" (but don't ask us for them - for legal reasons we can't supply them!).

To read timbre dumps, just open the .SYX or .MID file; if the program finds a PCM ROM dump (MT32_PCM.ROM or CM32L_PCM.ROM) in the same directory then that will automatically be used, otherwise you will be asked to locate a ROM dump file.

To read the factory timbres, just open the control ROM dump file ("MT32_CONTROL.ROM" or "CM32L_CONTROL.ROM"), and make sure that there's also a corresponding ROM dump file in the same directory.

To read just the waveform data and no instruments, simply open the PCM ROM dump file (MT32_PCM.ROM or CM32L_PCM.ROM).

Timbre dumps can be either raw 'SysEx dump extracts' (most common and usually with .SYX extension), or Standard MIDI files (.MID) containing SysEx data (the latter will be read as any other MIDI file, then the MIDI tracks will be parsed to find any compatible timbre dumps).